[PATCH v2 0/2] PM / devfreq: exynos-ppmu: Add the support of PPMUv2

[PATCH v2 0/2] PM / devfreq: exynos-ppmu: Add the support of PPMUv2

[Chanwoo Choi]

This patch-set add the support of PPMU ((Platform Performance Monitoring Unit)
version 2.0 which is used on Exynos5433. The exynos-ppmu.c driver supports
both PPMUv1.1 and PPMUv2. This patch-set is testd on Exynos5433-based board.

The SoC list using PPMUv1.1
- Exynos4210/4212/4412, Exynos3250, Exynos5260
The SoC list using PPMUv2
- Exynos5433, Exynos7420

Changes from v1:
(https://lkml.org/lkml/2015/7/22/834)
- Add const keyword to the instance of struct devfreq_event_ops/of_device_id
- Modify the register name of PPMU v2 ('PPMUv2_*' -> 'PPMU_V2_*')
- Reduce the unneed call function of exynos_bus_get_ops()

Chanwoo Choi (2):
  PM / devfreq: exynos-ppmu: Add the support of PPMUv2 for Exynos5433
  PM / devfreq: exynos-ppmu: Update documentation to support PPMUv2

 .../bindings/devfreq/event/exynos-ppmu.txt         |  42 ++++-
 drivers/devfreq/event/exynos-ppmu.c                | 170 ++++++++++++++++++++-
 drivers/devfreq/event/exynos-ppmu.h                |  70 +++++++++
 3 files changed, 273 insertions(+), 9 deletions(-)

-- 
1.8.5.5

[PATCH v2 1/2] PM / devfreq: exynos-ppmu: Add the support of PPMUv2 for Exynos5433

[Chanwoo Choi]

This patch adds the support for PPMU (Platform Performance Monitoring Unit)
version 2.0 for Exynos5433 SoC. Exynos5433 SoC must need PPMUv2 which is
quite different from PPMUv1.1. The exynos-ppmu.c driver supports both PPMUv1.1
and PPMUv2.

Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
---
 drivers/devfreq/event/exynos-ppmu.c | 170 ++++++++++++++++++++++++++++++++++--
 drivers/devfreq/event/exynos-ppmu.h |  70 +++++++++++++++
 2 files changed, 233 insertions(+), 7 deletions(-)

diff --git a/drivers/devfreq/event/exynos-ppmu.c b/drivers/devfreq/event/exynos-ppmu.c
index 7d99d13bacd8..f9901f52a225 100644
--- a/drivers/devfreq/event/exynos-ppmu.c
+++ b/drivers/devfreq/event/exynos-ppmu.c
@@ -1,7 +1,7 @@
 /*
  * exynos_ppmu.c - EXYNOS PPMU (Platform Performance Monitoring Unit) support
  *
- * Copyright (c) 2014 Samsung Electronics Co., Ltd.
+ * Copyright (c) 2014-2015 Samsung Electronics Co., Ltd.
  * Author : Chanwoo Choi <cw00.choi@samsung.com>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -82,6 +82,15 @@ struct __exynos_ppmu_events {
 	PPMU_EVENT(mscl),
 	PPMU_EVENT(fimd0x),
 	PPMU_EVENT(fimd1x),
+
+	/* Only for Exynos5433 SoCs */
+	PPMU_EVENT(d0-cpu),
+	PPMU_EVENT(d0-general),
+	PPMU_EVENT(d0-rt),
+	PPMU_EVENT(d1-cpu),
+	PPMU_EVENT(d1-general),
+	PPMU_EVENT(d1-rt),
+
 	{ /* sentinel */ },
 };
 
@@ -96,6 +105,9 @@ static int exynos_ppmu_find_ppmu_id(struct devfreq_event_dev *edev)
 	return -EINVAL;
 }
 
+/*
+ * The devfreq-event ops structure for PPMU v1.1
+ */
 static int exynos_ppmu_disable(struct devfreq_event_dev *edev)
 {
 	struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
@@ -200,10 +212,158 @@ static const struct devfreq_event_ops exynos_ppmu_ops = {
 	.get_event = exynos_ppmu_get_event,
 };
 
+/*
+ * The devfreq-event ops structure for PPMU v2.0
+ */
+static int exynos_ppmu_v2_disable(struct devfreq_event_dev *edev)
+{
+	struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
+	u32 pmnc, clear;
+
+	/* Disable all counters */
+	clear = (PPMU_CCNT_MASK | PPMU_PMCNT0_MASK | PPMU_PMCNT1_MASK
+		| PPMU_PMCNT2_MASK | PPMU_PMCNT3_MASK);
+
+	__raw_writel(clear, info->ppmu.base + PPMU_V2_FLAG);
+	__raw_writel(clear, info->ppmu.base + PPMU_V2_INTENC);
+	__raw_writel(clear, info->ppmu.base + PPMU_V2_CNTENC);
+	__raw_writel(clear, info->ppmu.base + PPMU_V2_CNT_RESET);
+
+	__raw_writel(0x0, info->ppmu.base + PPMU_V2_CIG_CFG0);
+	__raw_writel(0x0, info->ppmu.base + PPMU_V2_CIG_CFG1);
+	__raw_writel(0x0, info->ppmu.base + PPMU_V2_CIG_CFG2);
+	__raw_writel(0x0, info->ppmu.base + PPMU_V2_CIG_RESULT);
+	__raw_writel(0x0, info->ppmu.base + PPMU_V2_CNT_AUTO);
+	__raw_writel(0x0, info->ppmu.base + PPMU_V2_CH_EV0_TYPE);
+	__raw_writel(0x0, info->ppmu.base + PPMU_V2_CH_EV1_TYPE);
+	__raw_writel(0x0, info->ppmu.base + PPMU_V2_CH_EV2_TYPE);
+	__raw_writel(0x0, info->ppmu.base + PPMU_V2_CH_EV3_TYPE);
+	__raw_writel(0x0, info->ppmu.base + PPMU_V2_SM_ID_V);
+	__raw_writel(0x0, info->ppmu.base + PPMU_V2_SM_ID_A);
+	__raw_writel(0x0, info->ppmu.base + PPMU_V2_SM_OTHERS_V);
+	__raw_writel(0x0, info->ppmu.base + PPMU_V2_SM_OTHERS_A);
+	__raw_writel(0x0, info->ppmu.base + PPMU_V2_INTERRUPT_RESET);
+
+	/* Disable PPMU */
+	pmnc = __raw_readl(info->ppmu.base + PPMU_V2_PMNC);
+	pmnc &= ~PPMU_PMNC_ENABLE_MASK;
+	__raw_writel(pmnc, info->ppmu.base + PPMU_V2_PMNC);
+
+	return 0;
+}
+
+static int exynos_ppmu_v2_set_event(struct devfreq_event_dev *edev)
+{
+	struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
+	int id = exynos_ppmu_find_ppmu_id(edev);
+	u32 pmnc, cntens;
+
+	/* Enable all counters */
+	cntens = __raw_readl(info->ppmu.base + PPMU_V2_CNTENS);
+	cntens |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
+	__raw_writel(cntens, info->ppmu.base + PPMU_V2_CNTENS);
+
+	/* Set the event of Read/Write data count  */
+	switch (id) {
+	case PPMU_PMNCNT0:
+	case PPMU_PMNCNT1:
+	case PPMU_PMNCNT2:
+		__raw_writel(PPMU_V2_RO_DATA_CNT | PPMU_V2_WO_DATA_CNT,
+				info->ppmu.base + PPMU_V2_CH_EVx_TYPE(id));
+		break;
+	case PPMU_PMNCNT3:
+		__raw_writel(PPMU_V2_EVT3_RW_DATA_CNT,
+				info->ppmu.base + PPMU_V2_CH_EVx_TYPE(id));
+		break;
+	}
+
+	/* Reset cycle counter/performance counter and enable PPMU */
+	pmnc = __raw_readl(info->ppmu.base + PPMU_V2_PMNC);
+	pmnc &= ~(PPMU_PMNC_ENABLE_MASK
+			| PPMU_PMNC_COUNTER_RESET_MASK
+			| PPMU_PMNC_CC_RESET_MASK
+			| PPMU_PMNC_CC_DIVIDER_MASK
+			| PPMU_V2_PMNC_START_MODE_MASK);
+	pmnc |= (PPMU_ENABLE << PPMU_PMNC_ENABLE_SHIFT);
+	pmnc |= (PPMU_ENABLE << PPMU_PMNC_COUNTER_RESET_SHIFT);
+	pmnc |= (PPMU_ENABLE << PPMU_PMNC_CC_RESET_SHIFT);
+	pmnc |= (PPMU_V2_MODE_MANUAL << PPMU_V2_PMNC_START_MODE_SHIFT);
+	__raw_writel(pmnc, info->ppmu.base + PPMU_V2_PMNC);
+
+	return 0;
+}
+
+static int exynos_ppmu_v2_get_event(struct devfreq_event_dev *edev,
+				    struct devfreq_event_data *edata)
+{
+	struct exynos_ppmu *info = devfreq_event_get_drvdata(edev);
+	int id = exynos_ppmu_find_ppmu_id(edev);
+	u32 pmnc, cntenc;
+	u32 pmcnt_high, pmcnt_low;
+	u64 load_count = 0;
+
+	/* Disable PPMU */
+	pmnc = __raw_readl(info->ppmu.base + PPMU_V2_PMNC);
+	pmnc &= ~PPMU_PMNC_ENABLE_MASK;
+	__raw_writel(pmnc, info->ppmu.base + PPMU_V2_PMNC);
+
+	/* Read cycle count and performance count */
+	edata->total_count = __raw_readl(info->ppmu.base + PPMU_V2_CCNT);
+
+	switch (id) {
+	case PPMU_PMNCNT0:
+	case PPMU_PMNCNT1:
+	case PPMU_PMNCNT2:
+		load_count = __raw_readl(info->ppmu.base + PPMU_V2_PMNCT(id));
+		break;
+	case PPMU_PMNCNT3:
+		pmcnt_high = __raw_readl(info->ppmu.base + PPMU_V2_PMCNT3_HIGH);
+		pmcnt_low = __raw_readl(info->ppmu.base + PPMU_V2_PMCNT3_LOW);
+		load_count = (u64)((pmcnt_high & 0xff) << 32) + (u64)pmcnt_low;
+		break;
+	}
+	edata->load_count = load_count;
+
+	/* Disable all counters */
+	cntenc = __raw_readl(info->ppmu.base + PPMU_V2_CNTENC);
+	cntenc |= (PPMU_CCNT_MASK | (PPMU_ENABLE << id));
+	__raw_writel(cntenc, info->ppmu.base + PPMU_V2_CNTENC);
+
+	dev_dbg(&edev->dev, "%25s (load: %ld / %ld)\n", edev->desc->name,
+					edata->load_count, edata->total_count);
+	return 0;
+}
+
+static const struct devfreq_event_ops exynos_ppmu_v2_ops = {
+	.disable = exynos_ppmu_v2_disable,
+	.set_event = exynos_ppmu_v2_set_event,
+	.get_event = exynos_ppmu_v2_get_event,
+};
+
+static const struct of_device_id exynos_ppmu_id_match[] = {
+	{
+		.compatible = "samsung,exynos-ppmu",
+		.data = (void *)&exynos_ppmu_ops,
+	}, {
+		.compatible = "samsung,exynos-ppmu-v2",
+		.data = (void *)&exynos_ppmu_v2_ops,
+	},
+	{ /* sentinel */ },
+};
+
+static struct devfreq_event_ops *exynos_bus_get_ops(struct device_node *np)
+{
+	const struct of_device_id *match;
+
+	match = of_match_node(exynos_ppmu_id_match, np);
+	return (struct devfreq_event_ops *)match->data;
+}
+
 static int of_get_devfreq_events(struct device_node *np,
 				 struct exynos_ppmu *info)
 {
 	struct devfreq_event_desc *desc;
+	struct devfreq_event_ops *event_ops;
 	struct device *dev = info->dev;
 	struct device_node *events_np, *node;
 	int i, j, count;
@@ -214,6 +374,7 @@ static int of_get_devfreq_events(struct device_node *np,
 			"failed to get child node of devfreq-event devices\n");
 		return -EINVAL;
 	}
+	event_ops = exynos_bus_get_ops(np);
 
 	count = of_get_child_count(events_np);
 	desc = devm_kzalloc(dev, sizeof(*desc) * count, GFP_KERNEL);
@@ -238,7 +399,7 @@ static int of_get_devfreq_events(struct device_node *np,
 			continue;
 		}
 
-		desc[j].ops = &exynos_ppmu_ops;
+		desc[j].ops = event_ops;
 		desc[j].driver_data = info;
 
 		of_property_read_string(node, "event-name", &desc[j].name);
@@ -354,11 +515,6 @@ static int exynos_ppmu_remove(struct platform_device *pdev)
 	return 0;
 }
 
-static struct of_device_id exynos_ppmu_id_match[] = {
-	{ .compatible = "samsung,exynos-ppmu", },
-	{ /* sentinel */ },
-};
-
 static struct platform_driver exynos_ppmu_driver = {
 	.probe	= exynos_ppmu_probe,
 	.remove	= exynos_ppmu_remove,
diff --git a/drivers/devfreq/event/exynos-ppmu.h b/drivers/devfreq/event/exynos-ppmu.h
index 4e831d48c138..05774c449137 100644
--- a/drivers/devfreq/event/exynos-ppmu.h
+++ b/drivers/devfreq/event/exynos-ppmu.h
@@ -26,6 +26,9 @@ enum ppmu_counter {
 	PPMU_PMNCNT_MAX,
 };
 
+/***
+ * PPMUv1.1 Definitions
+ */
 enum ppmu_event_type {
 	PPMU_RO_BUSY_CYCLE_CNT	= 0x0,
 	PPMU_WO_BUSY_CYCLE_CNT	= 0x1,
@@ -90,4 +93,71 @@ enum ppmu_reg {
 #define PPMU_PMNCT(x)			(PPMU_PMCNT0 + (0x10 * x))
 #define PPMU_BEVTxSEL(x)		(PPMU_BEVT0SEL + (0x100 * x))
 
+/***
+ * PPMU_V2.0 definitions
+ */
+enum ppmu_v2_mode {
+	PPMU_V2_MODE_MANUAL = 0,
+	PPMU_V2_MODE_AUTO = 1,
+	PPMU_V2_MODE_CIG = 2,	/* CIG (Conditional Interrupt Generation) */
+};
+
+enum ppmu_v2_event_type {
+	PPMU_V2_RO_DATA_CNT	= 0x4,
+	PPMU_V2_WO_DATA_CNT	= 0x5,
+
+	PPMU_V2_EVT3_RW_DATA_CNT = 0x22,	/* Only for Event3 */
+};
+
+enum ppmu_V2_reg {
+	/* PPC control register */
+	PPMU_V2_PMNC		= 0x04,
+	PPMU_V2_CNTENS		= 0x08,
+	PPMU_V2_CNTENC		= 0x0c,
+	PPMU_V2_INTENS		= 0x10,
+	PPMU_V2_INTENC		= 0x14,
+	PPMU_V2_FLAG		= 0x18,
+
+	/* Cycle Counter and Performance Event Counter Register */
+	PPMU_V2_CCNT		= 0x48,
+	PPMU_V2_PMCNT0		= 0x34,
+	PPMU_V2_PMCNT1		= 0x38,
+	PPMU_V2_PMCNT2		= 0x3c,
+	PPMU_V2_PMCNT3_LOW	= 0x40,
+	PPMU_V2_PMCNT3_HIGH	= 0x44,
+
+	/* Bus Event Generator */
+	PPMU_V2_CIG_CFG0		= 0x1c,
+	PPMU_V2_CIG_CFG1		= 0x20,
+	PPMU_V2_CIG_CFG2		= 0x24,
+	PPMU_V2_CIG_RESULT	= 0x28,
+	PPMU_V2_CNT_RESET	= 0x2c,
+	PPMU_V2_CNT_AUTO		= 0x30,
+	PPMU_V2_CH_EV0_TYPE	= 0x200,
+	PPMU_V2_CH_EV1_TYPE	= 0x204,
+	PPMU_V2_CH_EV2_TYPE	= 0x208,
+	PPMU_V2_CH_EV3_TYPE	= 0x20c,
+	PPMU_V2_SM_ID_V		= 0x220,
+	PPMU_V2_SM_ID_A		= 0x224,
+	PPMU_V2_SM_OTHERS_V	= 0x228,
+	PPMU_V2_SM_OTHERS_A	= 0x22c,
+	PPMU_V2_INTERRUPT_RESET	= 0x260,
+};
+
+/* PMNC register */
+#define PPMU_V2_PMNC_START_MODE_SHIFT	20
+#define PPMU_V2_PMNC_START_MODE_MASK	(0x3 << PPMU_V2_PMNC_START_MODE_SHIFT)
+
+#define PPMU_PMNC_CC_RESET_SHIFT	2
+#define PPMU_PMNC_COUNTER_RESET_SHIFT	1
+#define PPMU_PMNC_ENABLE_SHIFT		0
+#define PPMU_PMNC_START_MODE_MASK	BIT(16)
+#define PPMU_PMNC_CC_DIVIDER_MASK	BIT(3)
+#define PPMU_PMNC_CC_RESET_MASK		BIT(2)
+#define PPMU_PMNC_COUNTER_RESET_MASK	BIT(1)
+#define PPMU_PMNC_ENABLE_MASK		BIT(0)
+
+#define PPMU_V2_PMNCT(x)		(PPMU_V2_PMCNT0 + (0x4 * x))
+#define PPMU_V2_CH_EVx_TYPE(x)		(PPMU_V2_CH_EV0_TYPE + (0x4 * x))
+
 #endif /* __EXYNOS_PPMU_H__ */
-- 
1.8.5.5

[PATCH v2 2/2] PM / devfreq: exynos-ppmu: Update documentation to support PPMUv2

[Chanwoo Choi]

This patch updates the documentation to include the information of PPMUv2.
The PPMUv2 is used for Exynos5433 and Exynos7420 to monitor the performance
of each IP in Exynos SoC.

Cc: MyungJoo Ham <myungjoo.ham@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
---
 .../bindings/devfreq/event/exynos-ppmu.txt         | 42 ++++++++++++++++++++--
 1 file changed, 40 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt b/Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt
index b54bf3a2ff57..e8fa6b6a1827 100644
--- a/Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt
+++ b/Documentation/devicetree/bindings/devfreq/event/exynos-ppmu.txt
@@ -11,7 +11,7 @@ to various devfreq devices. The devfreq devices would use the event data when
 derterming the current state of each IP.
 
 Required properties:
-- compatible: Should be "samsung,exynos-ppmu".
+- compatible: Should be "samsung,exynos-ppmu" or "samsung,exynos-ppmu-v2.
 - reg: physical base address of each PPMU and length of memory mapped region.
 
 Optional properties:
@@ -19,7 +19,7 @@ Optional properties:
 - clocks : phandles for clock specified in "clock-names" property
 - #clock-cells: should be 1.
 
-Example1 : PPMU nodes in exynos3250.dtsi are listed below.
+Example1 : PPMUv1 nodes in exynos3250.dtsi are listed below.
 
 		ppmu_dmc0: ppmu_dmc0@106a0000 {
 			compatible = "samsung,exynos-ppmu";
@@ -108,3 +108,41 @@ Example2 : Events of each PPMU node in exynos3250-rinato.dts are listed below.
 			};
 		};
 	};
+
+Example3 : PPMUv2 nodes in exynos5433.dtsi are listed below.
+
+		ppmu_d0_cpu: ppmu_d0_cpu@10480000 {
+			compatible = "samsung,exynos-ppmu-v2";
+			reg = <0x10480000 0x2000>;
+			status = "disabled";
+		};
+
+		ppmu_d0_general: ppmu_d0_general@10490000 {
+			compatible = "samsung,exynos-ppmu-v2";
+			reg = <0x10490000 0x2000>;
+			status = "disabled";
+		};
+
+		ppmu_d0_rt: ppmu_d0_rt@104a0000 {
+			compatible = "samsung,exynos-ppmu-v2";
+			reg = <0x104a0000 0x2000>;
+			status = "disabled";
+		};
+
+		ppmu_d1_cpu: ppmu_d1_cpu@104b0000 {
+			compatible = "samsung,exynos-ppmu-v2";
+			reg = <0x104b0000 0x2000>;
+			status = "disabled";
+		};
+
+		ppmu_d1_general: ppmu_d1_general@104c0000 {
+			compatible = "samsung,exynos-ppmu-v2";
+			reg = <0x104c0000 0x2000>;
+			status = "disabled";
+		};
+
+		ppmu_d1_rt: ppmu_d1_rt@104d0000 {
+			compatible = "samsung,exynos-ppmu-v2";
+			reg = <0x104d0000 0x2000>;
+			status = "disabled";
+		};
-- 
1.8.5.5